RX
2T 350

My26
My27

The perfect embodiment of the RideAbility philosophy applied to the largest displacement in two-stroke motocross engines. The RX 350 2T stands out clearly from traditional race-ready bikes, offering an incredibly smooth, linear and usable power delivery, ideal for riders seeking a relaxed yet effective riding experience based on long gear ratios and constant traction. With the updates introduced in MY27, this model increases its raw power and refines its structural strength, establishing itself as an absolute engineering benchmark within Betamotor’s cross line-up.

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351,7 CC

Displacement

78 mm

Bore

100 kg

Dry weight

340 mm

Ground clearance

Main features

ENGINE

New dedicated cast piston and an increase of ~1.5 hp

The heart of the RX 350 2T MY27 lies in its engine, which features a newly designed piston developed entirely from scratch. Cast using equipment designed and employed exclusively for this model, the new piston allows for a substantial reduction in overall weight. The weight saved results in a drastic reduction in internal inertia, translating into a significantly more responsive and lively engine. The efficiency of the new component is also due to the introduction of new piston rings featuring a PVD surface treatment, designed to lower the coefficient of friction and optimise sliding. Taken together, these sophisticated developments result in a net performance increase of around 1.5 hp compared to the previous model with the same configuration, enhancing the component’s overall efficiency, energy output and durability.

CHASSIS

Reinforced motocross silencer with structural stability

The exhaust system has been specifically updated to withstand the severe and prolonged stresses typical of intensive use on motocross circuits. The silencer features a major overhaul of its internal components, highlighted by the adoption of a new, structurally reinforced and more robust tapered pipe. This upgrade ensures excellent structural stability and prevents sagging or changes in power delivery even under conditions of maximum mechanical stress, keeping the exhaust’s performance completely uniform and consistent over time.

CHASSIS

New-generation Dunlop tyres and superior handling

Ground contact and steering precision take a decisive leap forward thanks to the introduction of advanced, latest-generation Dunlop tyres. These tyres, designed to maximise traction and grip on the track, utilise a technologically advanced structure that results in a lower weight compared to previous models. The reduction in unsprung and rotating masses brings immediate benefits to the vehicle’s overall handling, making the RX 350 2T incredibly agile, lightning-fast when entering corners and impeccable at absorbing road imperfections.

SPECIALISED FRAME GEOMETRY

The much-appreciated chromium-molybdenum frame is retained with unchanged geometry, offering a perfect balance between high-speed stability, manoeuvrability and an immediate feel from the very first laps on the track.

RED AND BLACK LACQUER

A bold aesthetic evolution that moves away from previous schemes in favour of a contemporary and aggressive red and black look, colour-coordinated with the black-finished frame and tank.

SOFT-COMROUND GRIP

New grips made from a soft compound, developed to effectively absorb vibrations transmitted from the handlebars and reduce forearm fatigue during longer races.

REINFORCED CHAIN GUIDE

A stiffened and reinforced chain guide structure designed to withstand impacts, mud and sand in the deepest ruts without deformation, ensuring maximum stability and precision in the final drive.

ENLARGED PINION GUARD

A new pinion guard redesigned to offer greater coverage and superior impact resistance, ensuring maximum safety on the track and full compliance with competition regulations.

KAYABA SUSPENSION

48 mm sealed cartridge front fork and 50 mm KYB monoshock, featuring dedicated settings developed specifically to ensure progressive response, support on big jumps and directional precision.

NISSIN AND GALFER BRAKING SYSTEM

Powerful and modulated braking guaranteed by Nissin floating calipers paired with Galfer wave discs (260 mm at the front and 240 mm at the rear).

ALUMINIUM SUBFRAME AND TOOL-FREE AIRBOX

The rigid yet lightweight rear subframe structure allows quick access to the air filter from the left side via an intuitive system that requires no tools

RACING CHAIN AND SILENT BLOCKS

Lightweight, smooth-running chain without O-rings to eliminate friction. Handlebar mounted on silent block mounts raised by 5 mm to dampen vibrations and optimise riding posture.

THE 350CC 2-STROKE ENGINE:
BETA’S ENGINEERING EXCELLENCE

The RX 350 2-stroke engine represents a unique feat of engineering in the modern motocross landscape, designed to offer everyone a bike that is both easy to ride and high-performing. The linear power delivery, free from sudden peaks, allows you to fully exploit the available power without incurring premature physical strain, reducing rider fatigue and enabling you to maintain precise lines and consistent lap times race after race. Explore the bike from every angle using the 360° studio viewer.

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manual brochure Tech Specs

CHASSIS

Frame

Molybdenum steel with double cradle split above the exhaust port

Wheelbase

1482 mm

Max length

2177 mm

Max width

830 mm

Max height

1260 mm

Seat height

945 mm

Ground clearance

340 mm

Footrest height

422 mm

Dry weight

100 kg (front 48 kg; rear 52 kg)

Fuel tank capacity

7,0 l

Cooling system capacity

1,3 l

Front suspension

Kayaba Hydraulic USD closecartridge fork with ø 48 mm shaft

Rear suspension

Kayaba Monoshock with progressive compound lever

Shock absorber stroke

133 mm

Front wheel travel

305 mm

Rear wheel travel

300 mm

Front brake

Wave disc ø260 mm and double-piston floating caliper

Rear brake

Wave disc ø240 mm and single-piston floating caliper

Front rim

21 x 1,6 – 36 holes

Rear rim

19 x 2,15 – 36 holes

Front tyre

80/100 – 21

Rear tyre

110/90 – 19

ENGINE

Type

Single cylinder, 2-stroke, liquid-cooled

Bore

78 mm

Stroke

73,6 mm

Displacement

351,7 cc

Compression ratio

12,45:1

Exhaust Valve

BPV system

Starter

Electric starter

Ignition

AC Kokusan – CDI digitale

Spark plug

2x MR7CI8

Induction system

Induction reed

Lubrication

Mixing

Carburettor

Keihin PWK 38

Clutch

Wet multi-disc clutch

Primary drive

Z. 27/72

Transmission

5 gears

Final transmission

Chain

Engine oil

SAE 10W/50

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